в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:29:15Z

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==Compare address==

<source lang="cpp">#include <ios>
#include <iostream>
#include <ostream>
struct MyStruct {
int x;
int y;
};
int main()
{
MyStruct demo[10];
std::cout << std::boolalpha;
std::cout << (&demo[0] < &demo[2]) << "\n";
std::cout << (&demo[0] == demo) << "\n";
std::cout << (&demo[10] > &demo[9]) << "\n";
std::cout << (&demo[0].x < &demo[0].y) << "\n";
}</source>
<pre class=codeResult>true
true
true
true</pre>

==Define pointer for structure==

<source lang="cpp">#include <iostream>
using namespace std;
struct MyStructure
{
int n;
float f;
float f2;
};
int main()
{
MyStructure myMyStructure;
MyStructure *ptrMyStructure;
//set the f of the structure
myMyStructure.f = 1000;
//intialize the pointer
ptrMyStructure = &myMyStructure;
//change the pointers f
ptrMyStructure->f = 2000;
//print out the structures f
cout << myMyStructure.f << "\n";
return 0;
}</source>
<pre class=codeResult>2000</pre>

==Pointers to structures==

<source lang="cpp">#include <iostream.h>
#include <stdlib.h>
struct Employee {
char title [50];
int year;
};

int main ()
{
char buffer[50];
Employee aEmployee;
Employee * pEmployee;
pEmployee = & aEmployee;
cout << "Enter title: ";
cin.getline (pEmployee->title,50);
cout << "Enter year: ";
cin.getline (buffer,50);
pEmployee->year = atoi (buffer);
cout << "\nYou have entered:\n";
cout << pEmployee->title;
cout << " (" << pEmployee->year << ")\n";
return 0;
}</source>
<pre class=codeResult>Enter title: Enter year:
You have entered:
(^CTerminate batch job (Y/N)? n</pre>

==Use -> for structure pointer==

<source lang="cpp">#include <iostream>
using namespace std;
struct account
{
int accountnum;
float balance;
float interestrate;
};
int main()
{
account myaccount;
account *ptraccount;
ptraccount->balance = 1000;
return 0;
}</source>

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C++ Tutorial/Structure/structure pointer - История изменений

в 14:21, 25 мая 2010

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